Genetic mapping of Fusarium wilt resistance in a wild banana Musa acuminata ssp. malaccensis accession
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ORIGINAL ARTICLE
Genetic mapping of Fusarium wilt resistance in a wild banana Musa acuminata ssp. malaccensis accession Fajarudin Ahmad1,2 · Nani M. Martawi3 · Yuyu S. Poerba1 · Hans de Jong4 · Henk Schouten5 · Gert H. J. Kema6 Received: 7 March 2020 / Accepted: 25 August 2020 © The Author(s) 2020
Abstract Banana is an important fruit and food crop, but is threatened by Fusarium wilt, one of the most devastating soil-borne fungal diseases. Only host resistance facilitates banana cultivation in infested soils around the world, but the genetic basis of Fusarium wilt of banana (FWB) is unknown. We selfed a heterozygous wild banana accession Musa acuminata ssp. malaccensis (Mam, AA, 2n = 22) to generate a mapping population and to investigate the inheritance of resistance to Race 1 and tropical race 4 (TR4) that cause FWB. Phenotyping (N = 217) revealed segregation for resistance, and genotyping by sequencing resulted in 2802 high-quality single-nucleotide polymorphic markers (SNPs) that were used for genetic mapping. Combined analyses of these data showed that a single dominant resistance locus controls resistance to Race 1 and maps near the distal part of chromosome 10. Recombinants, together with the position of the putative resistance gene, were further analysed using graphical genotyping, which retrieved markers flanking a 360 kb genetic region that associates with Race 1 resistance. The region contains 165 putative genes on the reference genome, including 19 leucine-rich repeat receptor-like kinase-like genes. At the same position and phase, we also identified a QTL for TR4 resistance, showing that the locus for resistance against Race 1 provided partial resistance to TR4. However, this effect was far less significant and hence not included in the mapping. These data support the breeding of new banana varieties with resistance to Fusarium wilt.
Introduction Fusarium wilt is the most devastating disease in banana culture and destroyed large plantations in the tropical countries of South America since the outbreak in the early 1900s (Ploetz 2005, 2015). The causal agents of the disease are a Communicated by Thomas Miedaner. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00122-020-03677-y) contains supplementary material, which is available to authorized users. * Gert H. J. Kema [email protected] 1
Research Center for Biology, Indonesian Institute of Sciences (LIPI), Jl. Raya Jakarta‑Bogor Km. 46, Bogor 16911, Indonesia
2
Wageningen Plant Research, Wageningen University and Research, P.O. Box 16, 6700 AA Wageningen, The Netherlands
3
Department Biology Education, Faculty of Education and Teacher Training, Universitas Sultan Ageng Tirtayasa, Kampus 2 Untirta, Jl Ciwaru Raya No. 25, Kota Serang, Banten, Indonesia
suite of Fusarium species (Maryani et al. 2019) that previously were classified as Fusarium oxysporum f. sp. cubense (Foc). They invade banana roots and subsequently colonize and occlude the vascular system which leads to severe wilting tha
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